Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
  • C08J9/32—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof from compositions containing microballoons, e.g. syntactic foams
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
  • C08J9/0014—Use of organic additives
  • C08J9/0023—Use of organic additives containing oxygen
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
  • C08J9/22—After-treatment of expandable particles; Forming foamed products
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
  • C08J9/22—After-treatment of expandable particles; Forming foamed products
  • C08J9/224—Surface treatment
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2203/00—Foams characterized by the expanding agent
  • C08J2203/22—Expandable microspheres, e.g. Expancel®

Definitions

• the present invention relates to a solid powdery composition comprising microspheres and an inhibitor and a process for the preparation thereof.
• the invention further relates to use of the composition, a composition comprising a polymeric resin and preparation thereof, a process for working such a composition and objects of material obtainable thereby.
• Thermally expandable microspheres including a thermoplastic polymer encapsulating a propellant may be used as a foaming agent when working polymeric materials, for example by extrusion or injection moulding.
• the microspheres may cause discolouration of the material.
• thermoplastic microspheres may be used when working polymeric materials for reducing the density or improving the texture.
• US 6582633 discloses that discolouration at high temperature moulding can be lowered by using microspheres in which the polymer shell has a high content of nitrile containing monomers.
• US 2661347 discloses use of maleic acid and maleic anhydride for decreasing discolouration of polymers of acrylonitrile.
• a preferred practice involves the use of solvents or plasticisers for the acrylonitrile polymers.
• US 3984499 discloses inclusion of half esters of maleic acid or fumaric acid in nitrile resins.
• US 3907932 discloses inclusion of an organotin maleate compound in a polymer composition of olefinic nitrile.
• EP 1471105 and WO 2005/023920 disclose use of microspheres in combination with a chemical blowing agent that may include citric acid. It is an object of the invention to provide a microsphere composition that can be used at working polymeric materials at high temperatures with satisfactory results and without causing unacceptable discolouration. It is another object of the invention to provide a process for working a polymeric resin with expanded or thermally expandable microspheres as an additive.
• one aspect of the invention concerns a solid powdery composition
• a solid powdery composition comprising expanded or unexpanded thermally expandable microspheres including a thermoplastic polymer shell encapsulating a propellant and from about 0.1 to about 50 wt% of at least one inhibitor selected from the group consisting of acids having a melting point below about 200 0 C and precursors therefore, said acid not being citric acid.
• Another aspect of the invention concerns a process for the preparation of such a composition
• a process for the preparation of such a composition comprising mixing expanded or unexpanded thermally expandable microspheres including a thermoplastic polymer shell encapsulating a propellant with from about 0.1 to about 50 wt% of at least one inhibitor selected from the group consisting of acids having a melting point below about 200 0 C and precursors therefore, said acid not being citric acid.
• Still another aspect of the invention concerns use of such a composition as a foaming agent in working of polymeric resins.
• Still another aspect of the invention concerns a composition
• a composition comprising a polymeric resin, expanded or thermally expandable microspheres including a thermoplastic polymer shell encapsulating a propellant, and from about 0.1 to about 50 wt%, based on the amount of the expandable microspheres, of at least one inhibitor selected from the group consisting of acids having a melting point below about 200 0 C and precursors therefore, said acid not being citric acid.
• Still another aspect of the invention concerns a process for the preparation of a composition
• a process for the preparation of a composition comprising mixing mixing a polymeric resin with expanded or unexpanded thermally expandable microspheres including a thermoplastic polymer shell encapsulating a propellant and with from about 0.1 to about 50 wt% of at least one inhibitor selected from the group consisting of acids having a melting point below about 200 0 C and precursors therefore, said acid not being citric acid.
• a further aspect of the invention concerns a process for working a polymeric resin composition as described above, i.e. a composition comprising a polymeric resin and, admixed therein, expanded or unexpanded thermally expandable microspheres including a thermoplastic polymer shell encapsulating a propellant and from about 0.1 to about 50 wt%, based on the amount of the microspheres, of at least one inhibitor selected from the group consisting of acids having a melting point below about 200 0 C and precursors therefore, said acid not being citric acid.
• Still a further aspect of the invention concerns objects of optionally foamed polymeric materials obtainable by a process of working a resin as described above comprising a step of expanding the expandable microspheres.
• Thermally expandable microspheres are known in the art and described in detail in, for example, US Patents No. 3615972, 3945956, 5536756, 6235800, 6235394 and 6509384, in EP 486080, in JP laid open patent application, Laid Open No. 87-286534, and in WO 2004/072160.
• the propellant is normally a liquid having a boiling temperature not higher than the softening temperature of the thermoplastic polymer shell.
• the propellant evaporates to increase the internal pressure at the same time as the shell softens, resulting in significant expansion of the microspheres, normally from about 2 to about 5 times their diameter.
• the temperature at which the expansion starts is called T start
• T max the temperature at which maximum expansion is reached
• Expanded microspheres can be obtained by expanding expandable microspheres as described herein, for example to a particle diameter from 2 to 5 times larger than the diameter of the unexpanded microspheres.
• the density of the expanded microspheres may, for example, be from 0.005 to 0.06 g/cm 3 .
• the expansion is effected by heating the expandable microspheres to a temperature above T start .
• the density of the expanded microspheres can be controlled by selecting temperature and time for the heating.
• the expansion can be effected by any suitable means for heating in any suitable device, as described in e.g. EP 0348372, WO 2004/056549 or WO 2006/009643.
• the microspheres may be expanded, expandable or a mixture of expanded and expandable microspheres.
• the microspheres preferably have a polymer shell made from homo- or co- polymers obtained by polymerising ethylenically unsaturated monomers.
• Those monomers can, for example, be nitrile containing monomers such as acrylonitrile, methacrylonitrile, ⁇ -chloroacrylonitrile, ⁇ -ethoxyacrylonitrile, fumaronitrile or crotonitrile; acrylic esters such as methyl acrylate or ethyl acrylate; methacrylic esters such as methyl methacrylate, isobomyl methacrylate, ethyl methacrylate or hydroxyethylmethacrylate; vinyl halides such as vinyl chloride; vinylidene halides such as vinylidene chloride; vinyl pyridine; vinyl esters such as vinyl acetate; styrenes such as styrene, halogenated styrenes or ⁇ -methyl styrene;
• the monomers for the thermoplastic polymer shell of the expandable microspheres comprise nitrile containing monomers, preferably in a high amount, for example from about 40 to 100 wt%, preferably from about 60 to 100 wt% of the monomers polymerised to the polymer shell.
• the amount of nitrile containing monomers may also be from about 80 to 100 wt%, most preferably from about 90 to 100 wt%, particularly from about 95 to 100 wt% of the monomers polymerised to the polymer shell.
• the nitrile containing monomers used for the polymer shell are preferably mainly selected from one or more of acrylonitrile and methacrylonitrile. If other ethylenically unsaturated monomers are present, they are preferably selected from one or more of acrylic esters or methacr ⁇ lic esters. It is also most preferred to only use non-halogen containing monomers.
• the softening temperature of the polymer shell is preferably within the range from about 80 to about 200 0 C, most preferably from about 115 to about 200 0 C.
• the monomers for the polymer shell also comprise crosslinking multifunctional monomers, such as one or more of divinyl benzene, ethylene glycol di(meth)acrylate, di(ethylene glycol) di(meth)acrylate, triethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, 1,6- hexanediol di(meth)acrylate, glycerol di(meth)acrylate, 1,3-butanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, 1 ,10-decanediol di(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, triallylformal tri(meth)acrylate, allyl methacrylate, trimethyl
• the polymer shell constitutes from about 60 to about 95 wt%, most preferably from about 70 to about 85 wt% of the total microsphere.
• crosslinking multifunctional monomers preferably constitute from about 0.1 to about 10 wt%, most preferably from about 0.1 to about 1 wt%, particularly most preferably from about 0.2 to about 0.5 wt% of the total amounts of monomers for the polymer shell.
• the propellant is normally a liquid having a boiling temperature not higher than the softening temperature of the thermoplastic polymer shell and may comprise hydrocarbons such as n-pentane, isopentane, neopentane, cyclopentane, cyclohexane, butane, isobutane, hexane, isohexane, neohexane, heptane, isoheptane, octane, isooctane, isodecane, isododecane, or mixtures thereof.
• hydrocarbons such as n-pentane, isopentane, neopentane, cyclopentane, cyclohexane, butane, isobutane, hexane, isohexane, neohexane, heptane, isoheptane, octane, isooctan
• hydrocarbon types can also be used, such as petroleum ether, or chlorinated or fluorinated hydrocarbons, such as methyl chloride, methylene chloride, dichloroethane, dichloroethylene, trichloroethane, trichloroethylene, trichlorofluoromethane, perfluorinated hydrocarbons, etc.
• chlorinated or fluorinated hydrocarbons such as methyl chloride, methylene chloride, dichloroethane, dichloroethylene, trichloroethane, trichloroethylene, trichlorofluoromethane, perfluorinated hydrocarbons, etc.
• the boiling point at atmospheric pressure may be within a wide range, preferably from about -20 to about 200°C, most preferably from about -20 to about 150°C.
• the propellant has a boiling point or boiling point range so a temperature above 50°C, more preferably above 60°C, most preferably above 70°C, but preferably not higher than about 150 0 C, would be required to evaporate at least 50 wt%, preferably at least 80 wt% of the propellant at atmospheric pressure.
• the propellant suitably makes up from about 5 to about 40 wt % of the microsphere.
• the propellant preferably comprises isooctane, suitably in an amount of more than 50 wt%, preferably more than 55 wt%, more preferably more than about 60 wt% most preferably more than about 70 wt%, or possibly even substantially consists of isooctane.
• the propellant may further comprise, preferably up to totally 50 wt%, of one or more of butanes, pentanes, hexanes, heptanes, petroleum distillates or other liquids giving a suitable boiling point range of the propellant.
• hydrocarbons for use in combination with isooctane are isobutane, isopentane, n- pentane, n-hexane, petroleum ether and n-heptane.
• the propellant is liquid at room temperature and has a boiling point at atmospheric pressure below the softening point of the polymer shell.
• the propellant constitutes from about 10 to about 30 wt%, most preferably from about 15 to about 25 wt% of the total microsphere.
• the microspheres may comprise further substances added during the production thereof, normally in an amount from about 1 to about 20 wt%, preferably from about 2 to about 10 wt%.
• Such substances are solid suspending agents, such as one or more of silica, chalk, bentonite, starch, crosslinked polymers, methyl cellulose, gum agar, hydroxypropyl methylcellulose, carboxy methylcellulose, colloidal clays, and/or one or more salts, oxides or hydroxides of metals like Al, Ca, Mg, Ba, Fe, Zn, Ni and Mn, for example one or more of calcium phosphate, calcium carbonate, magnesium hydroxide, barium sulphate, calcium oxalate, and hydroxides of aluminium, iron, zinc, nickel or manganese.
• solid suspending agents such as one or more of silica, chalk, bentonite, starch, crosslinked polymers, methyl cellulose, gum agar, hydroxypropyl methylcellulose, carboxy methylcellulose, coll
• the microspheres of the composition have a comparatively high T start and T max .
• T start is preferably within the range from about 80 to about 200 0 C, more preferably from about 130 to about 190 0 C, most preferably from about 150 to about
• T max preferably is higher than about 190°C, most preferably higher than about 200 0 C. Normally T max does not exceed about 300°C.
• the average particle size of the expandable microspheres is suitably from about 1 to about 500 ⁇ m, preferably from about 3 to about 200 ⁇ m, most preferably from about 5 to about 100 ⁇ m.
• T start By heating to a temperature above T start , it is normally possible to expand the microspheres from about 2 to about 7 times, preferably from about 4 to about 7 times, their diameter.
• Expandable microspheres as described above are commercially available under the trademark Expancel ® DU and may be produced by methods known in the art, for example as disclosed in the earlier mentioned US Patents No. 3615972, 3945956, 5536756, 6235800, 6235394 and 6509384, in EP 486080, in JP laid open patent application, Laid Open No. 87-286534, and in WO2004/072160. Also expanded microspheres are commercially available, for example under the trademark Expancel ® DE.
• the at least one inhibitor in the compositions of the invention is preferably an acid or a precursor therefore, i.e. a substance decomposing or in another way reacting to form at least one acid at the conditions prevailing during working of the polymeric resin.
• Such precursors include, for example, anhydrides of the acids.
• the acid may also be in its hydrated from.
• the melting point of the acid or its hydrate is below about 200 0 C, preferably below about 150°C. There is no critical lower limit and the inhibitors may, for example, have a melting point of at least about 0°C or at least about 30 0 C.
• the acid is preferably an organic acid preferably containing at least one carboxylic group in its solid form.
• a group of acids useful as inhibitors include formic acid, benzoic acid, oxalic acid, azelaic acid, malonic acid, malic acid, succinic acid, maleic acid, phthalic acid, acrylic acid, methacr ⁇ lic acid, mixtures thereof and precursors therefore, such as anhydrides.
• Particularly preferred inhibitors include azelaic acid, maleic acid, maleic acid anhydride, phthalic acid, phthalic acid anhydride, oxalic acid, succinic acid, succinic acid anhydride and mixtures thereof.
• the composition comprises a mixture of two or more inhibitors as described above or a combination of one inhibitor as described above with another compound, such as citric acid, a precursor therefore or any other compound useful as chemical blowing agent.
• Useful combinations include maleic acid or a precursor therefore, e.g. maleic anhydride, with one or more of oxalic acid or azelaic acid, or precursors therefore.
• the at least one inhibitor may, for example, also be a mixture comprising maleic acid and citric acid, or one or more precursor for at least one of them.
• the amount of inhibitor in the composition is preferably from about 0.1 to about 20 wt%, most preferably from about 0.5 to about 15wt%, particularly most preferably from about 1 to about 10 wt%, based on the amount of the expandable microspheres.
• a composition of the invention may be prepared by any practical method, for example by dry mixing expanded or expandable microspheres with an inhibitor or by mixing the microspheres with a solution of the inhibitor. It is also possible to mix the microspheres with a salt of the inhibitor and at a later stage acidify the salt to obtain the corresponding acid. If the microspheres comprise on the surface thereof alkaline substances such as hydroxides of metals, it may in some cases be appropriate to fully or partly remove such substances before mixing with the inhibitor.
• a composition comprising expanded or expandable microspheres and at least one inhibitor as described above is useful as a foaming agent at working of various kinds of polymeric thermoplastic and thermosetting resins, for example by mixing with the polymeric resin to provide a composition comprising a polymeric resin, expandable microspheres and at least one inhibitor.
• a composition comprising a polymeric resin may also be prepared by adding the components separately, wherein the preferred relative amounts of microspheres and inhibitor is as described above.
• polymeric resins examples include polyolefines, TPE (thermoplastic elastomers), thermoplastic polyesters, polycarbonates, polyamides, acetals, styrenic based polymers and PVC and copolymers thereof.
• polyolefines include polypropene, polyethene and copolymers thereof.
• thermoplastic elastomers examples include styrene block copolymers like SBS (styrene butadiene styrene) and SEBS (styrene ethylene butadiene styrene), olefinic thermoplastic/rubber blends like TPO (thermoplastic polyolefins) and TPE-O (thermoplastic elastomer olefinic), thermoplastic polyurethanes block copolymers, TPU (thermoplastic urethanes) and TPE-U (thermoplastic elastomer urethane), thermoplastic ether/ester copolymers like TEEE (thermoplastic elastomer ether ester block copolymer), and copolyamides like TPE-A (thermoplastic elastomer amide) and COPA (copolyamide).
• SBS styrene butadiene styrene
• SEBS styrene ethylene butadiene
• thermoplastic polyesters include PET (polyethylene terephtalate) and PBT (polybutadien terephtalate).
• polyamides include PA 6, PA 66, PA 11 and PA 12.
• acetals include POM (polyoximethylene).
• styrenic based polymers include PS (polystyrene), ABS (acrylonitrile butadiene styrene) and SAN (styrene acrylonitrile).
• polymeric resins of high melting temperature for example of at least 100°C or at least 180°C.
• polymeric resins include polypropylene, polystyrene, HD polyethylene and copolymers thereof, preferably comprising at least 50 mole %, most preferred at least 80 mole % of monomers of any of propylene, styrene or ethylene.
• any conventional method and machine can be used alone or in combination and may, for example, include one or more of calendering, extrusion, blow and injection moulding.
• the working is carried out at elevated temperature, preferably at least about 100 0 C, most preferably at least about 180 0 C, for example from about 180 to about 300 0 C or from about 210 to about 250°C. If expandable microspheres are used, they will cause foaming of the polymeric resin during the working.
• Expanded or expandable microspheres and at least one inhibitor as described above may be added to and mixed with the resin at any time, either as a pre-prepared composition as described above or separately.
• the microspheres and the inhibitor may be added directly to and mixed with a powder or granules of the resin before or after they have been charged to the machine. If mixed before being charged to the machine, it is possible to provide a simple mixture or a compound prepared by granulating the components together optionally without causing the microspheres to expand, e.g. by extrusion at a temperature below the expansion temperature at the prevailing pressure, and optionally together with other additives desirable for the final working.
• the amount of polymeric resin in the composition is preferably from about 70 to about 99.5 wt%, most preferably from about 80 to about 90 wt%.
• the amount of expandable microspheres is preferably from about 0.5 to about 20 wt%, most preferably from about 1 to about 10 wt%.
• the amount of inhibitor is preferably as described above.
• microspheres included in a masterbatch of a resin with lower melting point such as low melting polyolefines and copolymers thereof, for example EVA (ethyl-vinyl acetate), EBA (ethyl-buthyl acrylate), EMA (ethyl-methyl acrylate), ethylene-octene copolymer or low melting polyethylene.
• the masterbatch may also comprise an inhibitor as described above, otherwise the inhibitor is preferably added to the resin separately. If a masterbatch is used, the content of microspheres therein is preferably from about 10 to about 90 wt%, most preferably from about 20 to about 75 wt%.
• the machine When operating the machine, heat is applied to achieve a temperature sufficient for the resin to melt, for example at least about 100°C or at least about 180°C. Then the actual moulding or calendering takes place, i.e. the melted resin is forced by any suitable means such as a moulding screw through a series of calender rollers or an extrusion die, or is injected into a mould.
• a moulding screw through a series of calender rollers or an extrusion die, or is injected into a mould.
• the main part of the expansion takes place between the rollers, while in extrusion or moulding with expandable microspheres, the expansion mainly occurs when the pressure is released after passing the dye or within the mould, even if the temperature there is significantly lower.
• the main part of the expansion of the microspheres takes place after passing the moulding screw, where fully expanded microspheres otherwise could have been destroyed by the strong shear forces.
• the process of the invention has been found to be particularly advantageous for preparation of light weight objects through injection moulding. It has also been found that high quality objects can be obtained from polypropylene and other high melting polymers and/or when the polymer is maintained at elevated temperature, optionally at a melted state, for a long period of time, for example from about 3 min to about 5 hrs or from about 5 min to about 2 hrs. Expanded microspheres that do not themselves cause any significant foaming are particularly advantageous for thermosetting resins having short curing times, such as polyurethane, phenolic or epoxy resins.
• Example 1 Expandable MS (microspheres) of the type Expancel ® 980 DU 120 were dry-mixed with different amounts of inhibitors. 2 wt% of this mixture was subsequently mixed with PP (polypropene) beads from Borealis (BF330 MO MFR 18g/10 min 230 0 C, 2.16 kg). The mix of PP, MS and stabiliser was moulded in a Demag Ergotech injection moulding machine with 50 tons clamping force and a 40 mm screw, to form 100X50 mm plates of 5 mm thickness. The injection speed was 140 ccm/sec, the set temperature from hopper to nose was 190-200-220-230°C, the mould temperature was 15°C and the cooling time was 90 sec. The brightness of the moulded PP plates was measured using a Minolta Spectrophotometer CM 3610 d. The results appear in the table below:
• Example 2 Mixtures of Expancel 980 DU 120 and 5 wt% inhibitor were tested as in Example 1. The results appear in the table below:
• Example 3 Mixtures of Expancel 980 DU 120 and 5 wt% inhibitor were tested as in Example 1 with the exception for the set temperature from hopper to nose was 190- 200-210-230 0 C. The results appear in the table below:
• Example 4 Mixtures of Expancel 980 DU 120 and 1 wt% inhibitor were tested as in Example 3 with the exception that the cooling time was 60 sec. The results appear in the table below:
• Example 5 Mixtures of Expancel 980 DU 120 and various amounts of inhibitors were tested as in Example 1 with the exception for the set temperature from hopper to nose was 190-200-210-230 0 C. The results appear in the table below:

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• 2006
  • 2006-11-10 WO PCT/SE2006/050465 patent/WO2007073318A1/en active Application Filing
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